"The One I Love is My Little Sister But She's Not a Little Sister" 2018

Name: "The One I Love is My Little Sister But She's Not a Little Sister"
Released: 2018
Cast: Yua Nagae, Yui Ogura, Eri Kitamura, Tasuku Hatanaka, Chinatsu Akasaki

Synopsis:

Suzuka Nagami is a beautiful third-year middle school student who has excellent grades and is the student council president. She wrote a novel about a little sister who dotes on her older brother, and the novel wins a light novel award. After they discuss the matter, Yuu is the one who debuts as a proxy light novel author instead of Suzuka, under the pen name Chikai Towano.